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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.ftp-nb-get" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>ftp_nb_get</refname>
<refpurpose>Retrieves a file from the FTP server and writes it to a local file (non-blocking)</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>ftp_nb_get</methodname>
<methodparam><type>FTP\Connection</type><parameter>ftp</parameter></methodparam>
<methodparam><type>string</type><parameter>local_filename</parameter></methodparam>
<methodparam><type>string</type><parameter>remote_filename</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>FTP_BINARY</constant></initializer></methodparam>
<methodparam choice="opt"><type>int</type><parameter>offset</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
<function>ftp_nb_get</function> retrieves a remote file from the FTP server,
and saves it into a local file.
</para>
<para>
The difference between this function and <function>ftp_get</function> is that
this function retrieves the file asynchronously, so your program can perform
other operations while the file is being downloaded.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>ftp</parameter></term>
<listitem>
&ftp.parameter.ftp;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>local_filename</parameter></term>
<listitem>
<para>
The local file path (will be overwritten if the file already exists).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>remote_filename</parameter></term>
<listitem>
<para>
The remote file path.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
<para>
The transfer mode. Must be either <constant>FTP_ASCII</constant> or
<constant>FTP_BINARY</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>The position in the remote file to start downloading from.</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns <constant>FTP_FAILED</constant> or <constant>FTP_FINISHED</constant>
or <constant>FTP_MOREDATA</constant>, or &false; on failure to open the local file.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&ftp.changelog.ftp-param;
<row>
<entry>7.3.0</entry>
<entry>
The <parameter>mode</parameter> parameter is now optional. Formerly it
has been mandatory.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>ftp_nb_get</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Initiate the download
$ret = ftp_nb_get($ftp, "test", "README", FTP_BINARY);
while ($ret == FTP_MOREDATA) {
// Do whatever you want
echo ".";
// Continue downloading...
$ret = ftp_nb_continue($ftp);
}
if ($ret != FTP_FINISHED) {
echo "There was an error downloading the file...";
exit(1);
}
?>
]]>
</programlisting>
</example>
<example>
<title>Resuming a download with <function>ftp_nb_get</function></title>
<programlisting role="php">
<![CDATA[
<?php
// Initiate
$ret = ftp_nb_get($ftp, "test", "README", FTP_BINARY,
filesize("test"));
// OR: $ret = ftp_nb_get($ftp, "test", "README",
// FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA) {
// Do whatever you want
echo ".";
// Continue downloading...
$ret = ftp_nb_continue($ftp);
}
if ($ret != FTP_FINISHED) {
echo "There was an error downloading the file...";
exit(1);
}
?>
]]>
</programlisting>
</example>
<example>
<title>
Resuming a download at position 100 to a new
file with <function>ftp_nb_get</function>
</title>
<programlisting role="php">
<![CDATA[
<?php
// Disable Autoseek
ftp_set_option($ftp, FTP_AUTOSEEK, false);
// Initiate
$ret = ftp_nb_get($ftp, "newfile", "README", FTP_BINARY, 100);
while ($ret == FTP_MOREDATA) {
/* ... */
// Continue downloading...
$ret = ftp_nb_continue($ftp);
}
?>
]]>
</programlisting>
</example>
</para>
<para>
In the example above, <filename>newfile</filename> is 100 bytes smaller
than <filename>README</filename> on the FTP server because we started
reading at offset 100. If we didn't disable
<constant>FTP_AUTOSEEK</constant>, the first 100 bytes of
<filename>newfile</filename> would be <literal>'\0'</literal>.
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ftp_nb_fget</function></member>
<member><function>ftp_nb_continue</function></member>
<member><function>ftp_fget</function></member>
<member><function>ftp_get</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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